The army finally arrived in the town of Munduberra, west of Gayndah, on Friday morning - four days after flood levels there peaked, flooding 100 homes and businesses in the town and the same number in outlying areas.

North Burnett Deputy Mayor Faye Whelan said many homes had been flooded to their roofs, and a couple of houses had been split in half and partly washed away by the force of the water.

Local people, many of whom were elderly, were worn out after having been hit by floods only two years ago, Ms Whelan said.

They'd quietly hoped for immediate help, but it didn't come.

"I'm a little bit angry," she said.

The premier said he understood people were angry, but with a disaster so broad, affecting so many communities, authorities were doing their best.

"There is an enormous amount that has been going on and an enormous amount of damage to sort out," he said.

"They are entitled to be angry and upset by it if they've lost everything. I'd be angry and upset too. I'd want to stand up and shout and scream."

The damage bill from the disaster is certain to climb into the billions, with infrastructure smashed, farms ruined, and so many homes and businesses across the state damaged or destroyed.

An early estimate of farming losses alone has been put at $100 million.

The Queensland Farmers' Federation says everyone from pig and dairy farmers to sugarcane and citrus growers urgently needs access to the highest levels of disaster assistance.

"Without further assistance many farmers will not have the resources to repair and recover, and the result will be a severe and prolonged economic impact on communities already battered by natural disasters," QFF chief executive Dan Galligan said on Friday.

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